False teeth



Jan. 2,1934. I H. c. BERRY 1,941,735

FALSE TEETH Filed Jan. 6, 1930 Patented Jan. 2, 1934 UNITED STATES1,941,735 HEISSUEE PATENT? OFFICE.

2 Claims.

This invention relates to dentistry, the primary object of the inventionbeing to provide artificial teeth that will insure the maximumefliciency in mastication with the minimum effort, and to eliminate gumirritation by the constant rubbing of the plates.

An important object of the invention is to provide false teeth that willnot lock when pressed together, thereby preventing irritation of thegums caused by the plates carrying the teeth over the gums.

Another important object of the invention is the provision of falseteeth wherein the cusps of the upper and lower cooperating teeth are soconstructed that they will cut the food rather than grind it.

With the foregoing and other objects in view, which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodi ment of the invention herein disclosed, may be made within thescope of what is claimed, without departing from the spirit of theinvention.

Referring to the drawing:

Figure 1 is a sectional view through plates and cooperating teethsupported by the plates.

Figure 2 is a plan view of the occlusal surfaces of the teeth.

Figure 3 is an elevational view of one of the teeth.

Figure 4 is a plan view of one of the teeth.

Figure 5 is a plan view of a tooth illustrating a modified form ofocclusal surface.

Figure 6 is a view of a tooth showing a further modified form ofocclusal surface.

Figure 7 is a view illustrating the cooperation between the occlusalsurfaces of the teeth of upper and lower plates.

Figure 8 is a plan view of the occlusal surface of a block used in plateor bridge work.

Referring to the drawing in detail, the reference character 5 designatesa plate in which the teeth constructed in accordance with the presentinvention are positioned.

The occlusal surfaces of the teeth are so constructed that the cusps 6are disposed longitudinally of the teeth and arranged in zig zagformation, the ends of the cusps of one tooth meeting with the ends ofthe cusps of the adjacent teeth so that a continuous zig zag cuttingedge is formed throughout the length of the plate.

The cusps of the upper and lower teeth are so arranged with respect toeach other that they meet throughout the lengths of the cusps, to cutthe food as the cusps move together.

As shown, the cusps of the teeth have flattened biting surfaces 7, andthe surfaces of the teeth at the bases of the cusps slope downwardly and6 laterally as at 8 so that food will be forced laterally and will notclog the spaces between the cusps, to cause a locking of the upper andlower teeth.

In the form of the invention as shown by Figure 6 of the drawing, thecusp 9 which is designed primarily for smaller teeth, is substantially Ushaped, and it is to be understood that the cusp of the cooperatingtooth will be arranged to cross the cusp of the first mentioned tooth in7 a manner as clearly illustrated by Figure 7 of the drawing.

As shown by Figure 6, the cusp of the tooth is curved, this form of cuspbeing particularly designed for smaller teeth.

From the foregoing it will be obvious that due to this construction, thegrooves between the ridges will not become clogged, and the cusps willcause a cutting action of the teeth in place of the usual grindingnecessary in false teeth.

I claim:

1. In combination, coacting upper and lower dentures, embodying teethhaving occlusal surfaces formed with a cutting edge, .the cutting edgesof the coacting upper and lower dentures extending throughout thelengths of the teeth and disposed in a zig zag line, the zig zag linesof the cutting edges of the upper and lower dentures being offset withrespect to each other, whereby when said surfaces are brought together,the dentures may be actuated laterally and longitudinally in theocclusal plane, without cuspal interference.

2. In combination, coacting upper and lower dentures, embodying teethhaving their occlusal surface formed with a cutting edge, the cuttingedges of the coacting upper and lower dentures crossing each other atoblique angles with respect to each other, said occlusal surfaces lyingin a single plane at right angles to the vertical axis of the teeth,when said surfaces are brought together.

HARRY CHESTER BERRY.

